SPI bus protocol understanding

　　1. What is SPI:

　　　　Full duplex communication is a Motorola design, high-speed, synchronous serial external device communication protocol.

　　

　　2, SPI effect:

　　　　Used for data communication between devices.

 

　　3, SPI what constitutes:

　　　　1) MOSI: the master device outputs from device input lines, exclusive lines article

　　　　2) MISO: Master input device from the output line, dedicated strip lines also

　　　　3) SCK: clock line to provide interactive data pulses

　　　　4) CS: chip select control line.

　　

　　4, SPI implementation principles:

 

　　5, SPI workflow: